This is the best light to put into gun barrels, and look at breech plugs from the inside of the barrel. The blue light is also good to spot refinished blued guns. I bought the last 30 of them from the manufacturer. They won't make them again. Each light comes with 2 new battery's and also a extra set of 2 battery's. They measure 4" long x 1/4" OD. These are very popular with Martial Pistol collectors.
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